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Table 1 General description of publications included in the analysis (31 publications reviewed)1

From: Empirical studies on informal patient payments for health care services: a systematic and critical review of research methods and instruments

Classification category Sub-categories N Reference index in Appendix 1
Type of publication Journal articles 24 1,2,3,4,5,7,8,10,11,12,13,14,15,16,17,18,20,25,26,27,28,29, 30,31
  Reports, books 7 6,9,19,21,22,23,24
Year of publication After 2005 13 1,2,3,4,5,6,7,8,9,10,11,12,13
  2001-2005 11 14,15,16,17,18,19,20,21,22,23,24
  1995-2000 7 25,26,27,28,29,30,31
Year of data collection After 2005 1 6
  2001-2005 12 1,2,5,8,9,10,11,13,15,16,17,24
  1996-2000 9 12,14,18,19,20,21,22,25,26
  1990-1995 4 27,29,30,31
  Not clear 5 3,4,7,23,28
Origin of the study (type of country by World Bank) Low-income countries 8 5,6,9,11,16,18,26,28
  Lower-middle-income countries 10 7,8,9,13,14,15,16,17,22,25
  Upper-middle-income countries 12 1,2,10,16,19,20,21,23,25,27,29,30
  High-income countries 9 2,3,4,12,16,21,24,25,31
Number of countries included in the study Single country 26 1,3,4,5,6,7,8,10,11,12,13,14,15,17,18,19,20,22,23,24,26,27, 28,29,30,31
  Several countries 5 2,9,16,21,25
  Descriptive 15 8,10,11,13,15,19,20,21,22,23,24,25,27,28,31
  Analytical 18 1,3,4,5,12,13,14,15,16,17,18,19,20,23,24,26,29,30
Objective of the study Predictive 3 7,13,19
  Not stated explicitly 3 2,6,9
  1. 1One publication can be associated with more than one sub-category.